Archibald fairgrieve



A. FAIRGRIE'VE. sTovB PIPE THIMBLE.

Patented Dc. 16,1890.

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UNITED STATES PATENT OFFICE.

ARCHIBALD FAIRGRIEVE, OF TORONTO, CANADA.

STOVE-PIPE THIMBLE.

SPECIFICATION forming part of Letters Patent No. 442,965, dated Decernber I6, 1890. Application led March 2 l 1890. Serial No. 345,380. (No model.)

T0 a/ZZ whom it may concern:

Be it known that I, ARCHIBALD FAIRGRIEVE, a subject of .the Queen of Great Britain, residing at the city of Toronto, in the Province of Ontario, Dominion of Canada, have invented certain new and useful Improve ments in Stove-Pipe Tbimbles, of which the following is a specification.

The accompanyingdrawings represent one form of my thimble.

Figure l is a sectional elevation, and Fig. 2 is a plan of the same.

My invention essentially consists iu constructing a sheet-metal cylinder of such diameter as to permit the stove-pipe to pass easily through it, and surrounding that cylinder with another sheet-metal cylinder of such diameter as to leave an annular space between them, in connecting the ends of the two cylinders together by metal connections, and in filling the annular space with a light reproof material, such as asbestus liber or mineral wool.

Referring to the drawings, Fig. l, A is the inner cylinder, of sheet metal, such as tinplate. B is the outer cylinder. C is the annular space between them.

h is a circular end piece made of sheet metal by stamping; but it may be of east metal.

The innerand outer cylinders are connected to l) in the following manner: A slight turn or bulge of the metal at end of the cylinder is made, as shown at d (l. The circular end piece h is made of the section shown, and forming steps upon which the cylinders A and B rest, and has suflicient width to allow the turn-overs or bul ges (l d to come within its iianges e e. The metal e e is then turned over and secured upon the bulges d d, and thereby firmly iixes each cylinder in its true position and leaving the annular space C between them. I then till the space C with such {ire-proof or non-conducting material as asbestus fiber or mineral wool. The disk or fia-nge F, which is of metal, either cast or sheet, is then put on and seeuredto the nner cylinder, as shown on the drawings, by turning over the end of the cylinder upon the projection made on F. The iange F is shown square, and is so made for thimbles used in passing through Iioors and in some forms of partition-Walls, but may be round or octagonal or other shapes. I also make them Without a square iiauge and connect the two cylinders at each end in the same manner, as Sho wn by b, and already described. In such cases I usually rivet a strap or straps of sheet metal to the outer cylinder, so that by means of the straps the thimble may be secured in its proper position in the wall.

That I claim as my invention, and desire to secure by Letters Patent, is-

l. The combination of two cylinders having the tlanges e, the circular end pieces having the bulges d, in which the anges e enter, and the iilling in the space C for holding the cylinders apart and the flanges in the bulges. Y

2. The combination of two cylinders having the flanges e and the outer one having straps of metal riveted to the outside thereof, the circular end pieces having the bulges d, in which the flanges e enter, and the iillingin the space C for holding the cylinders apart and the flanges in the bulges.

ARCHIBALD FAIRGRIEVE.

Witnesses:

K. FRASER, A. FRASER. 

